In the 'MakeNamedMaterial' section replace "matte" with "mattetranslucent", and the texture/color parameters are called Kr and Kt.
Kr is diffuse reflection, for "matte" Kd is diffuse reflection. So rename Kd as Kr and you should be good.
Kt is transmissive color I think, it's the color that will seem to shine through the skin, for a light skin you'll want a slightly red/pink color, for dark skin maybe add a bit more blue..

So,
MakeNamedMaterial "Victoria4/2_SkinHead" "string type" ["matte"]
"texture Kd" ["Color_Mul_6"]

becomes,
MakeNamedMaterial "Victoria4/2_SkinHead" "string type" ["mattetranslucent"]
"texture Kr" ["Color_Mul_6"]
"texture Kt" [0.4 0.1 0.2]

Note that the Kt values above are just a starting point, you'll need to experiment a bit. :)

Software: OS X 10.8 - Poser Pro 2012 SR2 - Luxrender 1.0RC3 - Pose2Lux
Hardware: iMac - 3.06 GHz Core2Duo - 12 GB RAM - ATI Radeon HD 4670 - 256 MB